Orthopedic Shoulder And Review | Dr Hutaif Shoulder & E -...

Question 1

A 70-year-old female with severe rheumatoid arthritis and a massive, irreparable rotator cuff tear undergoes a reverse total shoulder arthroplasty (RTSA). How does the design of the RTSA alter the biomechanics of the glenohumeral joint compared to its native state?

Explanation

Reverse total shoulder arthroplasty (RTSA) alters shoulder biomechanics by moving the center of rotation inferiorly and medially. This significantly increases the moment arm of the deltoid muscle, allowing it to substitute for the deficient rotator cuff and initiate shoulder elevation.

Question 2

A 24-year-old professional volleyball player presents with progressive, painless weakness in his dominant shoulder. Physical examination reveals isolated atrophy of the infraspinatus muscle with normal bulk of the supraspinatus. External rotation strength is 3/5. Compression of a nerve is suspected. At what specific anatomic location is the entrapment most likely occurring?

Explanation

The suprascapular nerve innervates the supraspinatus and then passes through the spinoglenoid notch to innervate the infraspinatus. Entrapment at the spinoglenoid notch (often due to a paralabral cyst in overhead athletes) causes isolated infraspinatus atrophy and weakness. Entrapment at the suprascapular notch would affect both the supraspinatus and infraspinatus.

Question 3

A 20-year-old male presents with recurrent anterior shoulder instability. An MRI reveals a classic Bankart lesion. Which specific ligamentous structure is primarily disrupted in this lesion, leading to anterior instability at 90 degrees of abduction?

Explanation

A Bankart lesion is an avulsion of the anterior-inferior glenoid labrum along with the attached anterior band of the inferior glenohumeral ligament (IGHL) complex. The anterior band of the IGHL is the primary static restraint to anterior translation of the humeral head when the arm is abducted to 90 degrees and externally rotated.

Question 4

A 35-year-old male presents with the inability to actively raise his right arm above shoulder level following an axillary lymph node dissection 3 months ago. Physical examination reveals prominent medial winging of the scapula that worsens when pushing against a wall. Which nerve is most likely injured?

Explanation

Medial scapular winging is caused by paralysis of the serratus anterior muscle, which is innervated by the long thoracic nerve. This nerve is at risk during axillary dissection. Injury to the spinal accessory nerve causes paralysis of the trapezius, resulting in lateral scapular winging.

Question 5

A 50-year-old diabetic female complains of 4 months of progressive shoulder stiffness and pain. Radiographs are normal. Examination shows a marked restriction of both active and passive range of motion, with external rotation being the most severely limited. What is the most characteristic histologic finding in the joint capsule of this condition?

Explanation

The patient has adhesive capsulitis (frozen shoulder). Histologically, it is characterized by a dense, cellular, fibroblastic proliferation of the joint capsule with an increased ratio of type III to type I collagen, closely resembling the pathology seen in Dupuytren's disease. Frank inflammation is minimal or absent.

Question 6

A 22-year-old collegiate baseball pitcher presents with deep, vague shoulder pain and clicking during the throwing motion. He has a positive O'Brien's active compression test. Diagnostic arthroscopy demonstrates a detachment of the superior labrum and the origin of the long head of the biceps tendon from the glenoid. Which SLAP tear classification type does this represent?

Explanation

A Type II SLAP (Superior Labrum Anterior and Posterior) tear involves detachment of the superior labrum and the biceps anchor from the superior glenoid tubercle. Type I is fraying of an intact labrum. Type III is a bucket-handle tear with an intact biceps anchor. Type IV is a bucket-handle tear that extends into the biceps tendon.

Question 7

A 65-year-old female sustains a displaced, 4-part proximal humerus fracture after a fall. Based on modern quantitative anatomical studies, which vessel provides the predominant blood supply to the humeral head, placing it at the highest risk for avascular necrosis if disrupted?

Explanation

Recent anatomical studies (e.g., Hettrich et al.) demonstrated that the posterior humeral circumflex artery provides the predominant blood supply (up to 64%) to the humeral head. This overturned the traditional teaching that the anterior humeral circumflex artery (via the arcuate branch) was the main supplier.

Question 8

A 60-year-old male has an asymptomatic, full-thickness supraspinatus tear discovered incidentally on an MRI taken for neck pain. What is the most likely natural history of this rotator cuff tear if managed non-operatively?

Explanation

Asymptomatic rotator cuff tears frequently enlarge over time. Studies have shown that up to 50% will become symptomatic within 2-3 years, and the progression of tear size correlates strongly with the onset of pain and dysfunction. Spontaneous healing of full-thickness tears does not occur, and fatty infiltration is generally irreversible.

Question 9

A 25-year-old mountain biker falls directly onto the point of his shoulder. Radiographs demonstrate superior displacement of the distal clavicle by 150% relative to the acromion, with a significantly widened coracoclavicular interval. Based on the Rockwood classification, which ligaments are ruptured in this injury?

Explanation

This is a Rockwood Type III (or higher, depending on posterior/superior displacement magnitude) acromioclavicular joint injury. Type I is a sprain of the AC ligaments. Type II involves ruptured AC ligaments but intact CC ligaments. Type III and above involve rupture of both the AC and CC ligaments.

Question 10

When evaluating a patient with a midshaft clavicle fracture, which of the following is considered an ABSOLUTE indication for operative fixation?

Explanation

Absolute indications for open reduction and internal fixation (ORIF) of a clavicle fracture include open fractures, neurovascular compromise, and severe skin tenting causing impending skin breakdown. Shortening (>2 cm) and comminution are considered relative indications.

Question 11

A 68-year-old male with primary glenohumeral osteoarthritis is undergoing preoperative planning for a total shoulder arthroplasty. His CT scan demonstrates biconcave glenoid wear with posterior subluxation of the humeral head. According to the Walch classification, what type of glenoid morphology is this?

Explanation

The Walch B2 glenoid is characterized by an asymmetric biconcave wear pattern with posterior wear and posterior subluxation of the humeral head. It is commonly seen in primary osteoarthritis and poses a challenge for glenoid component placement due to the risk of accelerated loosening if retroversion is not corrected.

Question 12

A 22-year-old elite tennis player presents with posterior shoulder pain during the late cocking phase of serving. Physical examination reveals glenohumeral internal rotation deficit (GIRD). The diagnosis of internal impingement is suspected. Which structures are most likely impinging on one another?

Explanation

Internal impingement typically occurs in overhead athletes during maximal abduction and external rotation (late cocking phase). It is caused by the impingement of the articular (undersurface) side of the posterosuperior rotator cuff (supraspinatus and infraspinatus) against the posterosuperior glenoid labrum.

Question 13

A 30-year-old competitive weightlifter feels a sudden 'pop' in his chest while performing a heavy bench press. He subsequently develops severe bruising over the anterior axillary fold and weakness in shoulder adduction and internal rotation. Where does the pectoralis major most commonly rupture in this scenario?

Explanation

Pectoralis major ruptures most commonly occur at the tendinous insertion onto the lateral lip of the bicipital groove of the humerus, particularly in weightlifters performing bench presses. The sternal head fibers, which insert most proximally and posteriorly, are typically the first to tear when the arm is extended and externally rotated under heavy load.

Question 14

A 55-year-old male slips on ice and falls on an outstretched hand. He presents with pain and weakness during internal rotation. A tear of the upper border of the subscapularis tendon is suspected. Which physical examination test is most sensitive and specific for evaluating an upper subscapularis tear?

Explanation

The bear hug test and the belly-press test are highly sensitive and specific for evaluating tears of the upper portion of the subscapularis. The lift-off test requires full internal rotation and is more indicative of a complete or lower subscapularis tear. Hornblower's sign evaluates the teres minor.

Question 15

A 13-year-old Little League baseball pitcher presents with 3 months of progressive throwing arm shoulder pain. Radiographs demonstrate widening and irregularity of the proximal humeral physis. What is the primary pathophysiology of this condition?

Explanation

Little League Shoulder is an overuse injury in skeletally immature throwing athletes. The rotational torque applied during the throwing motion causes a repetitive stress injury to the proximal humeral physis, functioning essentially as a chronic Salter-Harris Type I stress fracture. This manifests as widening and sclerosis on radiographs.

Question 16

A 28-year-old female hair stylist complains of vague aching in her right arm, paresthesias in the ulnar distribution, and fatigue that worsens when working with her arms overhead. Wright's test is positive. If this represents neurogenic thoracic outlet syndrome (TOS), compression of the brachial plexus most commonly occurs within which anatomic space?

Explanation

Neurogenic Thoracic Outlet Syndrome (TOS) is most commonly caused by compression of the lower trunk of the brachial plexus (C8-T1) within the interscalene triangle. The boundaries of this triangle are the anterior scalene, middle scalene, and the superior border of the first rib.

Question 17

A 40-year-old male is brought to the emergency department after a generalized tonic-clonic seizure. His right shoulder is locked in internal rotation and adduction, and he has a mechanical block to external rotation. An AP radiograph shows a 'lightbulb' appearance of the humeral head. Which associated skeletal defect is most commonly present in this specific type of dislocation?

Explanation

The clinical presentation (locked in internal rotation after a seizure) and the radiographic 'lightbulb' sign (due to fixed internal rotation) are classic for a posterior shoulder dislocation. This injury is strongly associated with a reverse Hill-Sachs lesion, which is an impaction fracture of the anteromedial aspect of the humeral head against the posterior glenoid rim.

Question 18

A 24-year-old male complains of a painful grinding and snapping sensation at the superomedial border of his scapula with arm movement. Physical therapy and multiple steroid injections have failed to provide relief. If operative intervention (bursectomy/partial scapulectomy) is planned, which bursa is the primary target?

Explanation

Snapping scapula syndrome is caused by periscapular muscle imbalance, bony abnormalities (e.g., Luschka's tubercle, osteochondroma), or inflammation of the scapulothoracic bursae. The two main scapulothoracic bursae located at the superomedial angle are the supraserratus and infraserratus bursae.

Question 19

During an open Latarjet procedure for severe anterior shoulder instability with significant glenoid bone loss, the coracoid process is osteotomized and transferred to the anterior glenoid neck. Which specific anatomical structure remains attached to the transferred coracoid process to provide a dynamic 'sling effect'?

Explanation

The Latarjet procedure involves transferring the coracoid process, along with its attached conjoint tendon (short head of the biceps and coracobrachialis), through a split in the subscapularis muscle to the anterior glenoid. The tension of the conjoint tendon across the anterior-inferior capsule provides a dynamic 'sling' that prevents anterior translation of the humeral head.

Question 20

A 45-year-old male presents with acute, severe, unrelenting right shoulder pain that started spontaneously and lasted for 2 weeks. As the severe pain begins to subside, he notes profound weakness and noticeable atrophy of his shoulder abductors and external rotators. An MRI of the cervical spine and shoulder is unremarkable. What is the most likely diagnosis?

Explanation

Parsonage-Turner syndrome (idiopathic brachial neuritis) is characterized by the sudden onset of severe, unremitting shoulder pain. As the pain resolves over weeks, patients develop striking patchy weakness, denervation, and atrophy in muscles supplied by the brachial plexus, most commonly involving the periscapular, deltoid, or rotator cuff muscles.

Question 21

Which of the following baseplate positions minimizes the risk of scapular notching in Reverse Total Shoulder Arthroplasty (RTSA)?

Explanation

Scapular notching is a common complication of RTSA. To minimize impingement of the humeral component against the inferior scapular neck, the glenosphere baseplate should be placed with inferior translation (overhanging the inferior glenoid margin by 2-4 mm) and inferior tilt. This improves the impingement-free arc of motion and mechanical advantage of the deltoid.

Question 22

A 28-year-old volleyball player presents with insidious onset of vague posterior shoulder pain and isolated weakness in external rotation. Shoulder abduction strength is normal. MRI arthrogram is most likely to show a paralabral cyst in which of the following locations?

Explanation

Isolated weakness in external rotation with normal abduction suggests compression of the suprascapular nerve at the spinoglenoid notch. At this level, the nerve has already given off its motor branches to the supraspinatus muscle. Spinoglenoid cysts are highly associated with posterosuperior labral tears in overhead athletes.

Question 23

Which of the following is a recognized difference in complication profiles between the single-incision anterior approach and the two-incision (modified Boyd-Anderson) approach for distal biceps tendon repair?

Explanation

The single-incision anterior approach requires deeper retraction, resulting in a higher risk of neurapraxia to the lateral antebrachial cutaneous nerve (LABCN) and radial nerve. Conversely, the two-incision approach (modified Boyd-Anderson) historically carries a higher risk of heterotopic ossification and radioulnar synostosis, although modern muscle-splitting techniques have mitigated this risk.

Question 24

A 42-year-old patient presents with lateral scapular winging following a posterior cervical lymph node biopsy. The scapula is translated laterally, with the inferior pole rotated laterally. Which of the following procedures is most appropriate for a symptomatic, refractory case?

Explanation

Lateral scapular winging is caused by a spinal accessory nerve (CN XI) palsy leading to trapezius paralysis. The Eden-Lange procedure involves transferring the levator scapulae to the acromion, and the rhomboid major and minor to the infraspinatus fossa, restoring the suspensory function of the paralyzed trapezius.

Question 25

During the surgical management of a 'terrible triad' injury of the elbow, what is the generally accepted sequence of repair to restore joint stability?

Explanation

The standard surgical sequence for a terrible triad injury (elbow dislocation, radial head fracture, coronoid fracture) works deep to superficial and medial to lateral (from a lateral approach): 1) Fixation of the coronoid process or anterior capsule repair, 2) Fixation or replacement of the radial head, and 3) Repair of the lateral collateral ligament (LCL) complex. The MCL is usually only repaired if instability persists after these steps.

Question 26

According to Hertel's criteria, which of the following radiographic findings is the most reliable predictor for ischemia of the humeral head following a proximal humerus fracture?

Explanation

Hertel et al. described radiographic predictors for humeral head ischemia (AVN risk). The most reliable predictors are a posteromedial metaphyseal head extension (calcar length) of less than 8 mm, disruption of the medial hinge, and an anatomic neck fracture pattern.

Question 27

A 35-year-old male presents with posterior shoulder pain and paresthesias over the lateral deltoid. MRI reveals severe teres minor atrophy. Compression in the quadrilateral space is suspected. Which of the following boundaries forms the superior border of this anatomical space?

Explanation

The quadrilateral space is bordered by the teres minor (superiorly), teres major (inferiorly), long head of the triceps (medially), and the humeral shaft (laterally). It contains the axillary nerve and posterior humeral circumflex artery. Teres minor atrophy is a classic MRI finding in quadrilateral space syndrome.

Question 28

A 29-year-old weightlifter feels a 'pop' in his anterior shoulder while performing a heavy bench press. Examination reveals an asymmetric axillary fold. If surgical repair is undertaken, which of the following describes the correct anatomic insertion of the torn tendon fibers most commonly injured in this mechanism?

Explanation

Pectoralis major ruptures usually involve the sternal head, often failing at the insertion during eccentric loading (e.g., bench press). The sternal head fibers twist such that they insert deep and proximal to the clavicular head fibers on the lateral lip of the bicipital groove.

Question 29

A 24-year-old patient with recurrent anterior glenohumeral instability undergoes an MRI arthrogram, which demonstrates extravasation of contrast into the axillary pouch creating a 'J sign'. The labrum appears intact. What is the most likely diagnosis?

Explanation

A HAGL (Humeral Avulsion of the Glenohumeral Ligament) lesion involves the avulsion of the inferior glenohumeral ligament from the anatomic neck of the humerus. On MRI arthrogram, contrast leaks inferiorly through the axillary pouch, transforming the normal U-shaped pouch into a 'J sign'.

Question 30

A 40-year-old female sustains a coronal shear fracture of the distal humerus involving the capitellum. Radiographs and CT show a large fracture fragment consisting of articular cartilage and a thick layer of subchondral bone, with no extension into the trochlea. What is the correct Bryan and Morrey classification?

Explanation

In the Bryan and Morrey classification: Type I (Hahn-Steinthal) is a large osseous articular fragment of the capitellum. Type II (Kocher-Lorenz) is a purely articular cartilage fragment with minimal subchondral bone. Type III (Broberg-Morrey) is a comminuted capitellum fracture. Type IV (McKee) involves a coronal shear fracture extending into the trochlea.

Question 31

A 19-year-old rugby player sustains a severe blow to the medial shoulder and presents with a clinically posterior sternoclavicular joint dislocation. The patient is hemodynamically stable but dyspneic. Which of the following is true regarding this injury?

Explanation

Posterior sternoclavicular dislocations risk compression of mediastinal structures (trachea, esophagus, great vessels). Due to the potential for catastrophic vascular injury during reduction, cardiothoracic surgery backup is essential. In a 19-year-old, this injury is often a Salter-Harris physeal fracture-separation, as the medial clavicle physis is the last to close (typically ages 22-25).

Question 32

A 22-year-old collegiate baseball pitcher complains of posterior shoulder pain during the late cocking phase of throwing. Physical examination reveals glenohumeral internal rotation deficit (GIRD). Which of the following pathophysiologic mechanisms best explains 'internal impingement' in this patient?

Explanation

Internal impingement occurs in overhead athletes when the shoulder is in maximum abduction and external rotation (late cocking phase). This position causes the undersurface of the posterosuperior rotator cuff to impinge against the posterosuperior glenoid labrum, often exacerbated by GIRD and posterior capsular contracture.

Question 33

A 65-year-old female presents with bilateral, painless clunking of her scapulae with shoulder movement. MRI reveals bilateral, ill-circumscribed soft tissue masses deep to the inferior angle of the scapula with signal intensity similar to skeletal muscle interspersed with fat. What is the most likely diagnosis?

Explanation

Elastofibroma dorsi is a benign, slow-growing soft-tissue pseudotumor characteristically located at the inferior pole of the scapula, deep to the serratus anterior and latissimus dorsi. It is often bilateral (up to 30%) and occurs in older individuals. The MRI appearance of muscle-like fibrous tissue interspersed with streaks of fat is highly characteristic.

Question 34

Posterolateral rotatory instability (PLRI) of the elbow typically results from an injury to the lateral ulnar collateral ligament (LUCL). What is the anatomic insertion of the LUCL?

Explanation

The Lateral Ulnar Collateral Ligament (LUCL) is the primary restraint to posterolateral rotatory instability (PLRI). It originates on the lateral epicondyle and inserts distally on the supinator crest of the proximal ulna, acting as a supportive sling for the radial head.

Question 35

A 10-year-old Little League baseball pitcher presents with medial elbow pain. Radiographs reveal widening of the medial epicondyle apophysis. Which of the following is the primary static restraint to valgus stress of the elbow during the late cocking phase of throwing?

Explanation

The anterior bundle of the medial collateral ligament (MCL) is the primary static restraint to valgus stress at the elbow between 30 and 90 degrees of flexion. In children with open physes, the weak link is the apophysis, leading to 'Little League Elbow' (medial epicondyle apophysitis) rather than a ligamentous tear.

Question 36

During a Latarjet procedure for anterior shoulder instability, the coracoid process is osteotomized and transferred to the anterior glenoid. Which nerve is most at risk of injury when mobilizing the conjoint tendon and retracting it medially?

Explanation

The musculocutaneous nerve enters the deep surface of the coracobrachialis muscle approximately 5 to 8 cm distal to the tip of the coracoid process. Aggressive medial retraction of the conjoint tendon during a Latarjet procedure can stretch this nerve, resulting in neuropraxia or permanent injury.

Question 37

A 45-year-old male sustains a comminuted, unsalvageable radial head fracture. Intraoperatively, marked proximal translation of the radius is noted when a longitudinal traction force is applied. Which of the following is the most appropriate management?

Explanation

This patient has an Essex-Lopresti lesion (radial head fracture, interosseous membrane tear, and DRUJ disruption). Radial head excision alone is contraindicated as it will lead to proximal radial migration and chronic wrist pain. The correct treatment is a rigid metallic radial head arthroplasty to restore the longitudinal column, along with stabilization/pinning of the DRUJ.

Question 38

Which of the following is considered an absolute indication for operative fixation of a scapular body or neck fracture?

Explanation

Operative indications for scapular fractures include intra-articular glenoid step-off > 4 mm (to prevent rapid post-traumatic arthritis), severe medialization (> 20 mm), significant angular deformity (> 45 degrees), and certain complex superior shoulder suspensory complex injuries (e.g., 'floating shoulder' with significant displacement).

Question 39

Arthroscopy of a 21-year-old male with recurrent anterior shoulder dislocations reveals an anterior labral injury where the labrum and anterior band of the IGHL have avulsed from the glenoid but the underlying periosteum is intact, allowing the labrum to heal medially and inferiorly on the scapular neck. What is the diagnosis?

Explanation

An ALPSA (Anterior Labroligamentous Periosteal Sleeve Avulsion) lesion occurs when the anterior labrum is avulsed but the anterior scapular periosteum remains intact. The labro-ligamentous complex strips off the glenoid and displaces medially and inferiorly on the scapular neck. Unlike a classic Bankart lesion, the periosteum is not torn, but recurrence rates are higher if it is not fully mobilized and repaired to the anatomic footprint.

Question 40

A 14-year-old female gymnast presents with insidious onset of lateral elbow pain, clicking, and a 15-degree extension deficit. Radiographs demonstrate a radiolucent defect in the capitellum with a sclerotic margin and a loose body in the joint space. What is the most critical factor distinguishing this condition from Panner's disease?

Explanation

This patient has Osteochondritis Dissecans (OCD) of the capitellum. It is crucial to distinguish OCD from Panner's disease (osteochondrosis of the capitellum). Panner's disease occurs in younger children (usually under 10 years old), is self-limiting, and does not form loose bodies. Capitellar OCD occurs in adolescents (typically 12-15 years old) and frequently results in loose body formation and long-term mechanical symptoms requiring surgery.

Question 41

A 28-year-old professional volleyball player presents with isolated weakness in shoulder external rotation. He has no pain or history of acute trauma. Physical examination reveals normal strength in forward elevation and abduction, but profound weakness in external rotation with the arm at the side. Atrophy is noted in the infraspinatus fossa. Where is the most likely location of nerve entrapment?

Explanation

Entrapment of the suprascapular nerve at the spinoglenoid notch affects only the motor branch to the infraspinatus, leading to isolated weakness in external rotation and infraspinatus atrophy. Entrapment at the suprascapular notch would affect both the supraspinatus and infraspinatus, causing weakness in both abduction and external rotation.

Question 42

Which of the following statements is true regarding Cutibacterium acnes in the context of periprosthetic shoulder infection?

Explanation

Cutibacterium acnes (formerly Propionibacterium acnes) is an anaerobic, Gram-positive bacillus that resides in the sebaceous glands, particularly around the shoulder. It is notoriously slow-growing and indolent, often requiring cultures to be held for 14 days to avoid false-negative results in cases of periprosthetic joint infection.

Question 43

A 16-year-old male is brought to the emergency department after a rugby tackle. He complains of severe chest pain and difficulty swallowing. Examination reveals a depression over the medial aspect of the left clavicle. A CT scan confirms a posterior sternoclavicular dislocation. What is the most appropriate next step in management?

Explanation

Posterior sternoclavicular dislocations are orthopedic emergencies due to the proximity of mediastinal structures (trachea, esophagus, great vessels). Closed reduction should be attempted in the operating room under general anesthesia with a cardiothoracic surgeon available, as reduction maneuvers can unmask or cause a vascular injury.

Question 44

A 45-year-old woman presents with a 'drooping' right shoulder and weakness in overhead activities three months after undergoing a posterior triangle lymph node biopsy. On physical examination, her right scapula demonstrates lateral winging when she is asked to abduct her arm against resistance. Which nerve has most likely been injured?

Explanation

The spinal accessory nerve (CN XI) innervates the trapezius. Injury, often iatrogenic during procedures in the posterior triangle of the neck, causes a drooping shoulder and lateral scapular winging. In contrast, injury to the long thoracic nerve causes paralysis of the serratus anterior and medial scapular winging.

Question 45

A 22-year-old collegiate baseball pitcher presents with vague posterior shoulder pain. Physical examination demonstrates a 25-degree loss of internal rotation in the throwing shoulder compared to the contralateral side, with a concomitant increase in external rotation. What is the primary pathoanatomic cause of this Glenohumeral Internal Rotation Deficit (GIRD)?

Explanation

GIRD is primarily caused by contracture and thickening of the posteroinferior capsule, specifically the posterior band of the inferior glenohumeral ligament. This shifts the glenohumeral center of rotation posterosuperiorly during throwing, contributing to increased shear stress on the superior labrum (SLAP tears).

Question 46

A 30-year-old weightlifter feels a sudden 'pop' in his anterior chest while performing a heavy bench press. Examination reveals ecchymosis over the anterior arm and loss of the normal contour of the anterior axillary fold. If surgical repair is undertaken, which anatomic portion of the injured structure is most commonly found to be ruptured?

Explanation

Pectoralis major ruptures most commonly occur in weightlifters (especially during the eccentric phase of a bench press). The most frequently injured portion is the sternocostal (sternal) head tearing at or near its insertion on the lateral lip of the bicipital groove of the humerus.

Question 47

A 12-year-old Little League pitcher presents with progressive, activity-related shoulder pain. Radiographs reveal widening and lateral fragmentation of the proximal humeral physis. What is the most appropriate initial treatment?

Explanation

'Little League Shoulder' is a stress fracture (epiphysiolysis) of the proximal humeral physis due to repetitive torsional forces from throwing. The standard of care is complete cessation of throwing (rest) for typically 3 months until symptoms resolve and radiographic healing is noted, followed by physical therapy and a gradual return to throwing.

Question 48

In planning a Reverse Total Shoulder Arthroplasty (RTSA), the surgeon aims to minimize the risk of inferior scapular notching. According to biomechanical principles, which glenosphere positioning strategy is most effective for preventing this complication?

Explanation

Scapular notching occurs when the humeral polyethylene cup abuts the inferior scapular neck during adduction. To minimize this, the glenosphere should be placed low on the glenoid (inferior translation) with an inferior overhang (extending past the inferior glenoid rim) and an inferior tilt.

Question 49

Which of the following bony anatomical variants of the scapula is most strongly associated with the development of snapping scapula syndrome?

Explanation

Snapping scapula syndrome is caused by a disruption of the smooth gliding motion between the anterior scapula and the posterior chest wall. Luschka's tubercle is an abnormal, bony enlargement at the superomedial angle of the scapula that can cause friction, bursitis, and symptomatic crepitus (snapping).

Question 50

During the pathophysiological development of primary adhesive capsulitis, the profound fibroblastic proliferation and subsequent capsular contracture are most strongly driven by elevated levels of which cytokine?

Explanation

Adhesive capsulitis is characterized by dense fibrosis and contracture of the glenohumeral capsule and rotator interval. This fibrogenic cascade is heavily driven by elevated levels of Transforming Growth Factor-beta (TGF-B) and Platelet-Derived Growth Factor (PDGF).

Question 51

According to Hertel's radiographic criteria, which of the following fracture characteristics is the most reliable predictor of humeral head ischemia following a proximal humerus fracture?

Explanation

Hertel identified specific radiographic predictors for humeral head ischemia in proximal humerus fractures. The most significant predictors are a short metaphyseal head extension (calcar length < 8 mm attached to the articular segment), medial hinge disruption (> 2 mm), and disruption of the anatomic neck.

Question 52

A 40-year-old female presents to the emergency department with acute, agonizing right shoulder pain that prevents her from sleeping or moving her arm. Radiographs reveal an ill-defined, amorphous, cloudy opacity superior to the greater tuberosity. During which pathophysiologic phase of her disease process is she currently presenting?

Explanation

The patient has calcific tendinitis of the rotator cuff. The disease has three stages: pre-calcific, calcific (formative, resting, resorptive), and post-calcific. The resorptive phase is mediated by macrophages and giant cells phagocytosing the calcium (hydroxyapatite) deposits. It causes acute swelling, increased intratendinous pressure, and the most severe, agonizing pain.

Question 53

A 45-year-old male complains of an acute onset of severe, unprovoked right shoulder pain that woke him from sleep. The pain lasted for 2 weeks and was unresponsive to NSAIDs. As the pain finally subsided, he noticed profound weakness in overhead elevation and external rotation. MRI of the shoulder demonstrates diffuse T2 hyperintensity in the supraspinatus and infraspinatus muscles, with structurally intact tendons. What is the most likely diagnosis?

Explanation

Parsonage-Turner Syndrome (acute brachial neuritis) classically presents with acute, severe, unremitting shoulder pain lasting days to weeks, followed by patchy weakness and atrophy of the shoulder girdle musculature as the pain subsides. MRI shows denervation edema (diffuse T2 hyperintensity) in the affected muscles without tendon disruption.

Question 54

In a patient with a massive, irreparable posterosuperior rotator cuff tear and an intact subscapularis, a lower trapezius tendon transfer is performed. What is the primary functional goal of this specific transfer?

Explanation

The lower trapezius tendon transfer (often utilizing an Achilles tendon allograft) is indicated for massive, irreparable posterosuperior rotator cuff tears. Its vector closely mimics the infraspinatus, making it highly effective at restoring active external rotation and preventing the 'horn blower's' sign.

Question 55

A 25-year-old male sustains an anterior shoulder dislocation during a wrestling match. Following reduction, an MR arthrogram is obtained, revealing extravasation of contrast inferiorly forming a classic 'J' sign. Which structure has been avulsed?

Explanation

A Humeral Avulsion of the Glenohumeral Ligament (HAGL) lesion involves the avulsion of the inferior glenohumeral ligament (IGHL) from the anatomic neck of the humerus. On an MR arthrogram in the coronal plane, the normal U-shaped axillary pouch is disrupted, and contrast leaks inferiorly, creating a 'J' sign.

Question 56

A surgeon is considering a latissimus dorsi tendon transfer for a 55-year-old laborer with a massive rotator cuff tear. Which of the following concurrent physical examination findings is a widely accepted contraindication to this procedure?

Explanation

A latissimus dorsi tendon transfer is indicated for irreparable posterosuperior rotator cuff tears. However, an intact subscapularis is essential for providing anterior force-couple balance. A positive belly-press or lift-off test indicates a deficient subscapularis, which is a contraindication as the transfer would exacerbate superior/anterior head escape and cause pseudoparalysis.

Question 57

A 24-year-old sustains an anterior shoulder dislocation. After closed reduction, he has numbness over the lateral deltoid and cannot actively contract the muscle. At 3 weeks post-injury, he has no clinical improvement, and an EMG demonstrates fibrillation potentials in the deltoid and teres minor. What is the most appropriate management?

Explanation

Axillary nerve palsy is the most common neurologic complication of an anterior shoulder dislocation. Fibrillation potentials at 3 weeks indicate axonotmesis (Wallerian degeneration). However, most cases still recover spontaneously. The standard of care is clinical observation and supportive therapy, with a repeat EMG/NCS at 3 months to evaluate for reinnervation before considering surgical exploration.

Question 58

The stability of the long head of the biceps tendon (LHBT) as it enters the bicipital groove is maintained by the biceps pulley. Which three anatomical structures form this essential stabilizing sling?

Explanation

The biceps pulley complex stabilizes the long head of the biceps tendon in its groove. It is composed of the superior glenohumeral ligament (SGHL), the coracohumeral ligament (CHL), and the superior fibers of the subscapularis tendon. Disruption leads to medial subluxation of the LHBT.

Question 59

A 29-year-old elite tennis player presents with vague posterior shoulder pain and early fatigue. Examination reveals isolated atrophy of the teres minor. MR angiography demonstrates focal occlusion of the posterior circumflex humeral artery when the shoulder is positioned in abduction and external rotation. This pathology involves compression within a space bound superiorly by which structure?

Explanation

The patient has Quadrilateral Space Syndrome, which involves compression of the axillary nerve and posterior circumflex humeral artery. The boundaries of the quadrilateral space are the teres minor (superior), teres major (inferior), long head of the triceps (medial), and humeral shaft (lateral).

Question 60

When counseling a 35-year-old patient on the nonoperative management of a midshaft clavicle fracture, which of the following radiographic characteristics is recognized as the strongest independent risk factor for the development of a nonunion?

Explanation

Risk factors for nonunion of midshaft clavicle fractures treated nonoperatively include advanced age, female sex, smoking, and specific fracture characteristics: complete displacement (100% off translation), shortening greater than 2 cm, and severe comminution.

Question 61

A 28-year-old weightlifter presents with acute anterior shoulder pain after performing heavy bench presses. Examination reveals bruising over the medial arm, weakness in internal rotation, and loss of the anterior axillary fold contour. MRI confirms a complete pectoralis major tendon rupture. Which specific portion of the muscle-tendon unit is most commonly injured in this mechanism?

Explanation

Pectoralis major ruptures most frequently occur at the humeral insertion of the sternal head. During the eccentric phase of a bench press, the sternal head is under maximal tension, causing its tendinous insertion to fail first.

Question 62

A 55-year-old male with a massive, irreparable posterosuperior rotator cuff tear is scheduled for a latissimus dorsi tendon transfer. Which of the following preoperative clinical findings is considered an absolute contraindication for this procedure?

Explanation

Latissimus dorsi transfer relies on an intact anterior force couple (subscapularis) to balance the transferred tendon and stabilize the humeral head. Coracoacromial arch disruption and severe subscapularis deficiency are primary contraindications.

Question 63

A 35-year-old overhead athlete is diagnosed with glenohumeral internal rotation deficit (GIRD) and symptomatic internal impingement. Despite 6 months of targeted physical therapy, symptoms persist. If surgery is performed, which structure is typically targeted for release to address the primary pathomechanics?

Explanation

GIRD is primarily driven by a contracted posterior band of the inferior glenohumeral ligament (IGHL) and posterior capsule. If conservative management fails, a targeted posterior capsular release addresses the underlying restriction.

Question 64

A 65-year-old woman undergoes anatomical total shoulder arthroplasty for primary osteoarthritis. Six weeks postoperatively, she presents with severe anterior shoulder pain, significantly increased passive external rotation compared to her intraoperative baseline, and a positive belly-press test. What is the most likely complication?

Explanation

Significantly increased passive external rotation and a positive belly-press test acutely after total shoulder arthroplasty strongly indicate subscapularis tendon failure. This complication requires prompt diagnosis and potential surgical repair to prevent anterior instability.

Question 65

A 22-year-old rugby player has recurrent anterior shoulder instability. A 3D CT scan is used to evaluate the 'glenoid track'. An 'off-track' Hill-Sachs lesion is identified. Which of the following strictly defines an off-track lesion?

Explanation

An off-track lesion occurs when the medial margin of the Hill-Sachs lesion extends further medially than the medial margin of the glenoid track. This indicates a high risk of engagement and typically requires a Remplissage or bone block procedure.

Question 66

In the setting of reverse total shoulder arthroplasty (RTSA), scapular notching is a well-documented and frequent complication. Which surgical technique modification most effectively reduces the incidence of inferior scapular notching?

Explanation

Inferior translation (overhanging the inferior glenoid rim) and inferior tilt of the glenosphere decrease the risk of mechanical impingement of the humeral component against the scapular neck. This is the primary method to prevent scapular notching.

Question 67

A 45-year-old male presents with acute posterior shoulder pain and an inability to actively externally rotate his shoulder after a severe electrical shock. Radiographs demonstrate a 'lightbulb sign'. Which associated bony injury dictates the need for a bone grafting procedure rather than a soft tissue transfer (Modified McLaughlin) alone?

Explanation

Posterior shoulder dislocations are often associated with an anteromedial humeral head defect (reverse Hill-Sachs). Articular defects greater than 20-25% typically require bone grafting (allograft) to restore the articular arc and prevent recurrent instability.

Question 68

A 30-year-old male sustains a severe acromioclavicular (AC) joint injury. Radiographs show 200% superior displacement of the clavicle relative to the acromion. During CC ligament reconstruction, the surgeon targets the anatomic footprint of the conoid ligament. Where is this footprint located on the clavicle?

Explanation

The conoid ligament is the more medial and posterior of the coracoclavicular ligaments, attaching to the conoid tubercle about 45 mm medial to the distal end of the clavicle. The trapezoid ligament attaches more anteriorly and laterally, around 25 mm from the distal clavicle.

Question 69

A 25-year-old rugby player undergoes a Latarjet procedure for recurrent anterior shoulder instability with 25% glenoid bone loss. During the coracoid transfer, which nerve is at the greatest risk of injury when mobilizing the conjoined tendon?

Explanation

The musculocutaneous nerve typically enters the coracobrachialis 3 to 8 cm distal to the coracoid tip. Overzealous medial retraction of the conjoined tendon during a Latarjet procedure places this nerve at high risk for traction or iatrogenic injury.

Question 70

Which of the following surgical strategies best minimizes the risk of scapular notching during a reverse total shoulder arthroplasty (RTSA)?

Explanation

Scapular notching occurs when the medial aspect of the humeral component impinges on the inferior scapular neck. Inferior placement with an inferior overhang of the glenosphere and inferior tilt alters the impingement-free arc of motion, significantly reducing the incidence of notching.

Question 71

A 29-year-old overhead athlete presents with vague posterior shoulder pain and numbness over the lateral deltoid. MRI demonstrates isolated atrophy of the teres minor muscle. Entrapment of the axillary nerve in the quadrilateral space is suspected. What are the superior and inferior borders of this space?

Explanation

The quadrilateral space is bounded superiorly by the teres minor, inferiorly by the teres major, medially by the long head of the triceps, and laterally by the humeral shaft. It transmits the axillary nerve and posterior humeral circumflex artery.

Question 72

A 35-year-old male presents with a locked posterior shoulder dislocation after a seizure. CT scan reveals a reverse Hill-Sachs lesion involving 30% of the humeral head articular surface. Which of the following is the most appropriate surgical management?

Explanation

For reverse Hill-Sachs defects between 20% and 40% of the articular surface, transferring the lesser tuberosity or the subscapularis tendon (McLaughlin procedure) into the defect provides anterior stability. Arthroplasty is generally reserved for defects >40% or in older, low-demand patients.

Question 73

A 68-year-old female undergoes an anatomic total shoulder arthroplasty (TSA) for severe primary osteoarthritis. Preoperative CT showed a B2 glenoid with 20 degrees of retroversion. What is the most common mechanism of long-term failure in this patient?

Explanation

Glenoid component loosening is the most common cause of late failure in anatomic TSA. Patients with uncorrected B2 glenoids (biconcave, excessive posterior wear) are at a particularly high risk for early eccentric wear and catastrophic glenoid loosening.

Question 74

A 22-year-old pitcher experiences worsening anterior shoulder pain and a 'dead arm' sensation. Physical exam reveals a positive 'O/'Brien test' and pain on the 'peel-back' mechanism. If a Type II SLAP tear is confirmed, what is the defining characteristic of this lesion?

Explanation

A Type II SLAP tear involves detachment of the superior labrum and the origin of the long head of the biceps tendon from the glenoid. In overhead athletes, this is often driven by a 'peel-back' mechanism during late cocking and early acceleration phases of throwing.

Question 75

A 45-year-old male sustains an acromioclavicular (AC) joint injury. Radiographs reveal a 150% superior displacement of the clavicle relative to the acromion. During an anatomic coracoclavicular (CC) ligament reconstruction, where should the conoid and trapezoid ligaments be reconstructed relative to each other on the clavicle?

Explanation

The conoid ligament attaches to the conoid tubercle, which is located medially and posteriorly on the undersurface of the clavicle. The trapezoid ligament attaches more laterally and anteriorly. The conoid is the primary restraint to superior translation.

Question 76

A 75-year-old female sustains a severe 4-part proximal humerus fracture. According to Hertel/'s criteria, which of the following radiographic findings is the strongest predictor of humeral head ischemia?

Explanation

Hertel identified that a short metaphyseal head extension (<8 mm) and a disrupted medial hinge are highly predictive of ischemia. These factors indicate disruption of the anterior and posterior humeral circumflex arterial supply to the articular segment.

Question 77

A 40-year-old weightlifter feels a sudden 'pop' in his anterior chest while performing a heavy bench press. Examination reveals loss of the anterior axillary fold and weakness in internal rotation. During surgical repair, an understanding of the pectoralis major footprint is critical. Which statement is correct regarding its insertion?

Explanation

The pectoralis major tendon undergoes a 180-degree twist before inserting onto the lateral lip of the bicipital groove. The sternal head twists behind the clavicular head, inserting more superiorly (proximally) and deep relative to the clavicular head.

Question 78

A 55-year-old female with diabetes presents with insidious onset of severe, diffuse shoulder pain and significant loss of both active and passive range of motion, particularly external rotation. An MRI is obtained to rule out other pathology. What is the classic MRI finding associated with this condition?

Explanation

Adhesive capsulitis (frozen shoulder) typically demonstrates thickening and fibrosis of the joint capsule and the coracohumeral ligament on MRI, particularly in the region of the rotator interval. Obliteration of the axillary recess is also commonly seen.

Question 79

A 21-year-old collegiate baseball pitcher presents with glenohumeral internal rotation deficit (GIRD) and shoulder pain during the late cocking phase of throwing. What is the primary pathomechanical consequence of an untreated, significantly thickened posterior band of the inferior glenohumeral ligament (IGHL) in this athlete?

Explanation

A tight posterior capsule and thickened posterior band of the IGHL lead to a posterosuperior shift of the humeral head during the ABER position (abduction/external rotation). This shift causes internal impingement between the articular-sided cuff and the posterosuperior labrum.

Question 80

A 38-year-old female presents to the emergency department with acute, excruciating right shoulder pain. Radiographs reveal an amorphous, cloudy calcium deposit in the supraspinatus tendon. What phase of calcific tendinitis is associated with this severe, acute pain presentation?

Explanation

The resorptive phase of calcific tendinitis is marked by vascular invasion, macrophage infiltration, and calcium resorption. This inflammatory response leads to a 'toothpaste-like' consistency of the calcium deposit and causes the severe, acute pain typical of the condition.

Question 81

A 45-year-old male develops sudden, severe left shoulder pain that lasts for several weeks, followed by profound weakness in shoulder abduction and external rotation. Electromyography (EMG) confirms Parsonage-Turner syndrome (idiopathic brachial neuritis). Which of the following is the most appropriate initial management?

Explanation

Parsonage-Turner syndrome is a self-limiting, immune-mediated neuritis. Management consists of pain control (often requiring strong analgesics) during the acute phase, followed by physical therapy to maintain range of motion as nerve recovery occurs over months to years.

Question 82

During physical examination of a patient with suspected subscapularis pathology, the examiner performs the 'belly-press test' and the 'lift-off test'. Which specific portion of the subscapularis is maximally tested by the belly-press test?

Explanation

The belly-press (or bear-hug) test is highly sensitive for evaluating the upper portion of the subscapularis muscle and tendon. The lift-off test is generally more specific for evaluating the lower portion of the subscapularis.

Question 83

A 32-year-old patient presents with lateral winging of the scapula. The scapula is translated laterally, rotated downward, and the deformity is accentuated by resisted shoulder abduction. Which nerve is most likely injured in this patient?

Explanation

Lateral winging is characteristic of trapezius muscle paralysis, which is innervated by the spinal accessory nerve (CN XI). Medial winging (accentuated by pushing against a wall) is caused by serratus anterior weakness due to long thoracic nerve palsy.

Question 84

A 70-year-old male with a massive, irreparable posterosuperior rotator cuff tear presents with pseudoparalysis of the shoulder. He is considered for a reverse total shoulder arthroplasty (RTSA). How does the Grammont-style RTSA design biomechanically alter the shoulder to restore active elevation?

Explanation

The primary biomechanical advantage of a Grammont-style reverse TSA is the medialization and distalization of the joint/'s center of rotation. This dramatically increases the moment arm of the deltoid, allowing it to efficiently elevate the arm despite the lack of a functioning rotator cuff.

Question 85

A 19-year-old male football player sustains a high-energy blow to the medial shoulder. He presents with severe pain and a visually absent medial clavicle. CT scan shows posterior displacement of the medial clavicle. Given his age, what is the most likely true pathology?

Explanation

The medial clavicle physis is the last physis in the body to close, typically fusing between ages 20 and 25. Therefore, a posterior 'dislocation' in a 19-year-old is almost always a Salter-Harris physeal fracture-separation rather than a true joint dislocation.

Question 86

A 60-year-old male presents with chronic shoulder pain and weakness. MRI shows a massive tear of the supraspinatus and infraspinatus with Grade 4 Goutallier fatty infiltration. Which of the following makes him a poor candidate for a latissimus dorsi tendon transfer?

Explanation

A latissimus dorsi transfer for a massive, irreparable posterosuperior cuff tear relies on an intact or repairable subscapularis and a functional teres minor to maintain the transverse force couple. Severe fatty infiltration or dysfunction of the teres minor leads to poor outcomes.

Question 87

An 18-year-old male is evaluated for multidirectional instability (MDI) of the shoulder. He has generalized ligamentous laxity and positive sulcus signs bilaterally. Non-operative management with targeted physical therapy has failed after 9 months. If surgery is performed, what is the most critical intraoperative step to ensure success?

Explanation

The surgical treatment of choice for refractory MDI is a global capsular shift, which addresses the redundant capsule. Plication of the rotator interval is a critical component to eliminate inferior subluxation and tighten the anterior structures appropriately.

Question 88

A patient undergoes a superior capsular reconstruction (SCR) using a dermal allograft for an irreparable supraspinatus tear. For the graft to effectively depress the humeral head and restore the superior restraint, to which two structures must the graft be securely fixated medially and laterally?

Explanation

In a Superior Capsular Reconstruction (SCR), the graft is anchored to the superior glenoid (medially) and the greater tuberosity footprint (laterally). This acts as a static restraint to prevent superior migration of the humeral head.

Shoulder And Elbow: Review | Dr Hutaif Shoulder & Elbow -...

Orthopedic Shoulder And Review | Dr Hutaif Shoulder & E -...

Key Takeaway

Orthopedic Shoulder And Review | Dr Hutaif Shoulder & E -...

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